Fix relative paths in string-fn documentation for consistency

Signed-off-by: Apoll011 <[email protected]>

Author: Apoll011

book/functions/helpers/string-fn.md

@@ -31,9 +31,9 @@ The following standard methods operate on [strings](../../types/strings-chars.md
 | `sub_string`                   | <ol><li>start position, counting from end if < 0</li><li>_(optional)_ number of characters to extract, none if ≤ 0, to end if omitted</li></ol> | extracts a sub-string                                                                                                                                      |
 | `sub_string`                   | [range](../../variables/ranges.md) of characters to extract, from beginning if ≤ 0, to end if ≥ length                                                          | extracts a sub-string                                                                                                                                      |
 | `split`                        | _none_                                                                                                                                          | splits the string by whitespaces, returning an [array](../../types/arrays.md) of string segments                                                                       |
-| `split`                        | position to split at (in number of characters), counting from end if < 0, end if ≥ length                                                       | splits the string into two segments at the specified character position, returning an [array](../types/arrays.md) of two string segments                               |
-| `split`                        | <ol><li>delimiter character/string</li><li>_(optional)_ maximum number of segments, 1 if < 1</li></ol>                                          | splits the string by the specified delimiter, returning an [array](../types/arrays.md) of string segments                                                              |
-| `split_rev`                    | <ol><li>delimiter character/string</li><li>_(optional)_ maximum number of segments, 1 if < 1</li></ol>                                          | splits the string by the specified delimiter in reverse order, returning an [array](../types/arrays.md) of string segments                                             |
+| `split`                        | position to split at (in number of characters), counting from end if < 0, end if ≥ length                                                       | splits the string into two segments at the specified character position, returning an [array](../../types/arrays.md) of two string segments                               |
+| `split`                        | <ol><li>delimiter character/string</li><li>_(optional)_ maximum number of segments, 1 if < 1</li></ol>                                          | splits the string by the specified delimiter, returning an [array](../../types/arrays.md) of string segments                                                              |
+| `split_rev`                    | <ol><li>delimiter character/string</li><li>_(optional)_ maximum number of segments, 1 if < 1</li></ol>                                          | splits the string by the specified delimiter in reverse order, returning an [array](../../types/arrays.md) of string segments                                             |
 | `crop`                         | <ol><li>start position, counting from end if < 0</li><li>_(optional)_ number of characters to retain, none if ≤ 0, to end if omitted</li></ol>  | retains only a portion of the string                                                                                                                       |
 | `crop`                         | [range](../../variables/ranges.md) of characters to retain, from beginning if ≤ 0, to end if ≥ length                                                           | retains only a portion of the string                                                                                                                       |
 | `replace`                      | <ol><li>target character/sub-string</li><li>replacement character/string</li></ol>                                                              | replaces a sub-string with another                                                                                                                         |